Motorola GP320

Troubleshooting Flow Chart for Transmitter 3-3
3.0 Troubleshooting Flow Chart for Transmitter
START
No Power
Is There
B+ Bias for
Ant switch
CR101
Check Q111
Is Current
OK?
Is Control Voltage High
or Low at C119
Check PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Output Network
Is Power
OK?
Done
Check Drive to
Module
Is Drive
OK?
Troubleshoot VCO
Inspect PA Network/
Check Power Out of
U101 at Cap C160
Is Power
OK?
Replace U101
Is Power
OK?
Replace Q110
Done
Done
No
Ye s
Ye s
No
No
Ye s
Low
High
No
Ye s
Ye s
No
Ye s
No